Wheel chock device

Abstract

To provide a wheel stopper device capable of being correctly installed for a wheel while reducing a work burden.SOLUTION: A wheel stopper device 70 comprises a long belt-like band 80 with flexibility, and a pair of wheel stopper members 71 that are provided at both longitudinal ends of the band 80. The band 80 is looped over an outer peripheral surface 5t of a tire wheel 5 along the outer peripheral direction of the tire wheel 5 that is provided for a vehicle. Thus, the pair of wheel stopper members 71, which are suspended from both the longitudinal ends of the band 80, can be installed on the front and back of the tire wheel 5 on a parking road surface.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a wheel stopper device for preventing a vehicle, such as a high-altitude work vehicle, from running away. [Background technology]

[0002] When parking a vehicle such as a high-altitude work vehicle to perform work, in addition to braking the wheels with the parking brake (side brake), wedge-shaped wheel chocks are installed between the wheels and the parking surface to prevent the vehicle from running away (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-312455 Summary of the Invention [Problem to be solved by the invention]

[0004] However, if the wheel chocks are not installed correctly, the wheel chocks will not be effective, there is a risk of the vehicle running away, and work safety cannot be ensured. In addition, to install the wheel chocks between the wheels and the parking surface, the worker must bend over and perform the work, which is a significant burden on the worker.

[0005] The present invention has been made in view of the above-mentioned problems, and has an object to provide a wheel stopper device that can be correctly installed on a wheel while reducing the burden of the work. [Means for solving the problem]

[0006] In order to solve the above problems, the wheel stopper device of the present invention is a portable wheel stopper device that restricts the movement of a parked vehicle, and is characterized in that it comprises a long, flexible, strip-shaped band and a pair of wheel stopper members attached to both longitudinal ends of the band, and by hanging the band around the outer surface of a wheel attached to the vehicle in the circumferential direction of the wheel, the pair of wheel stopper members suspended from both longitudinal ends of the band can be installed in front of and behind the wheel on the parking road surface.

[0007] In the wheel stopper device having the above configuration, it is preferable that a pair of handles that can be gripped by a user are provided at a longitudinally intermediate portion of the band-shaped body, the handles being spaced apart from each other in the longitudinal direction by a predetermined distance.

[0008] In the wheel stopper device having the above configuration, it is preferable that the band is provided with a marking member for indicating the center position of the band in the longitudinal direction.

[0009] Furthermore, in the wheel stopper device having the above configuration, it is preferable that the band-shaped body is provided with a length adjustment mechanism for adjusting the length of the band-shaped body in the longitudinal direction.

[0010] Furthermore, in the wheel stop device of the above configuration, it is preferable that the wheel stop member has a connecting portion to which the longitudinal ends of the strip are connected, and that when viewed from a direction perpendicular to the underside of the wheel stop member, the connecting portion is located at a position that overlaps with the center of gravity of the wheel stop member. [Effects of the Invention]

[0011] According to the wheel stopper device of the present invention, when a long strip-shaped body is hung along the outer circumferential surface of a wheel, With this simple operation, a pair of wheel stopper members suspended from both longitudinal ends of the strip can be correctly installed on the wheels, thereby reducing the burden on the worker (the worker can install the wheel stopper members while maintaining an upright posture without having to bend over), and the wheel stopper's original effect can be fully utilized to prevent the vehicle from running away, thereby improving workability and safety. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a side view of a vehicle for working at height according to an embodiment of the present invention; [Figure 2] FIG. 2 is a functional block diagram of the safety device according to the present embodiment. [Figure 3] 1 is a perspective view of a state in which a wheel stopper device according to an embodiment of the present invention is installed on a tire / wheel; [Figure 4] FIG. 2 is a perspective view of the wheel stopper device. [Figure 5] FIG. [Figure 6] 4 is a perspective view showing a connecting portion between a wheel stopper member and a band of the wheel stopper device. FIG. [Figure 7] FIG. [Figure 8] FIG. 10 is a perspective view showing a modified example of the ring stopper member. DETAILED DESCRIPTION OF THE INVENTION

[0013] A preferred embodiment of the present invention will now be described with reference to the drawings. A vehicle for working at height 1 according to this embodiment is shown in Figure 1, and first, the overall configuration of the vehicle for working at height 1 will be described with reference to this figure.

[0014] As shown in Fig. 1, the aerial work vehicle 1 has a driver's cabin 7 at the front of the vehicle body 2, and is configured as a truck vehicle that can travel on a pair of left and right tires and wheels 5 (front wheels 5f and rear wheels 5r) arranged at the front and rear of the vehicle body 2. The vehicle body 2 is configured with a vehicle frame made up of a chassis frame on which the tires and wheels 5 (front wheels 5f and rear wheels 5r) are arranged, and a subframe attached to the chassis frame.

[0015] Jack devices 10 are provided on the front, rear, left, and right sides of the vehicle body 2 to lift and support the vehicle body 2 when working at height. The jack devices 10 are composed of a pair of left and right front jacks 10f disposed behind the front wheels 5f and a pair of left and right rear jacks 10r disposed behind the rear wheels 5r. Each jack 10f, 10r lifts and supports the vehicle body 2 by driving a jack cylinder 11 provided therein and extending it downward, thereby stabilizing the entire vehicle. A lower operating device 27 is provided at the rear end of the vehicle body 2 to operate the jacks 10f, 10r and a boom 30 (described later), etc.

[0016] A swivel base 20 driven by a swivel motor 24 and configured to rotate horizontally about a vertical axis is provided in the mounting area behind the driver's cabin 7 of the vehicle body 2. A base end of a boom 30 is attached to a support column 21 extending upward from the swivel base 20 via a foot pin 22 so as to be swingable (raise and lower) in the vertical direction. In addition, tool boxes 26 for storing work tools and equipment are provided on the left and right sides of the mounting area of ​​the vehicle body 2.

[0017] The boom 30 has a configuration in which, from the swivel base 20 side, a base boom 30a, an intermediate boom 30b, and a tip boom 30c are nested together, and the boom 30 can be extended and retracted in the axial direction (longitudinal direction) by the extension and retraction of a telescopic cylinder 31 installed inside. In addition, a derricking cylinder 23 is installed between the base boom 30a and the support column 21, and by extending and retracting this derricking cylinder 23, the entire boom 30 can be raised and lowered in the vertical plane.

[0018] A vertical post (not shown) is pivotally supported at the tip of the tip boom 30c so as to be swingable up and down. This vertical post is supported by an upper level bridge straddling the tip of the tip boom 30c. A ring cylinder (not shown) and a lower leveling cylinder 25 mounted between the boom base end 30a and the support column 21 perform swing control (leveling control) to maintain the boom 30 in a vertical position regardless of whether it is raised or lowered. A work platform 40 on which an operator sits is attached to this vertical post via a work platform bracket (not shown). A swing motor 34 (see FIG. 2) is provided inside this work platform bracket, and by driving this swing motor 34, the entire work platform 40 can be swiveled (horizontally rotated) around the vertical post. Here, because the vertical post is always maintained in a vertical position as described above, the floor surface of the work platform 40 is always maintained horizontal regardless of the boom 30's swing angle.

[0019] The work platform 40 is provided with an upper operating device 45 equipped with various operating means such as operating levers, operating switches, and operating dials that are operated by a worker on the work platform 40. Therefore, by operating the upper operating device 45, a worker on the work platform 40 can perform various operations such as rotating the swivel base 20 (rotating the swivel motor 24), raising and lowering the boom 30 (extending and retracting the hoisting cylinder 23), extending and retracting the boom 30 (extending and retracting the telescopic cylinder 31), and swinging the work platform 40 (rotating the swing motor 34).

[0020] As shown in FIG. 2, the operating mechanism of the jack device 10 (jacks 10f, 10r) and the aerial work device (swivel platform 20, boom 30, work platform 40, etc.) provided on the vehicle body 2 is configured to include a controller 60 that receives operation signals from the upper operation device 45 and the lower operation device 27 and controls the jack cylinder 11, swivel motor 24, hoisting cylinder 23, telescopic cylinder 31, swing motor 34, etc. (hereinafter collectively referred to as "hydraulic actuators"), a hydraulic unit 50 that supplies hydraulic oil to operate these hydraulic actuators, and a mounted battery 59 that serves as a power source for operating the jack device 10 and the aerial work device, etc.

[0021] An operation signal output by operating the upper operation device 45 or the lower operation device 27 is input to the controller 60. The controller 60 outputs a command signal corresponding to the operation signal to the hydraulic unit 50 (control valve 53).

[0022] The hydraulic unit 50 includes a hydraulic pump 51 that discharges hydraulic oil, a pump drive motor 52 that drives the hydraulic pump 51, and a control valve 53 that controls the supply direction and amount of hydraulic oil supplied from the hydraulic pump 51 to each hydraulic actuator. The pump drive motor 52 is driven by power supplied from a body battery 59 via an inverter 54. The control valve 53 includes an electromagnetic proportional control valve V1 corresponding to the jack cylinder 11, an electromagnetic proportional control valve V2 corresponding to the swing motor 24, an electromagnetic proportional control valve V3 corresponding to the hoisting cylinder 23, an electromagnetic proportional control valve V4 corresponding to the telescopic cylinder 31, and an electromagnetic proportional control valve V5 corresponding to the swing motor 34. Based on a command signal from the controller 60, the control valve 53 electromagnetically drives the spools of the electromagnetic proportional control valves V1 to V5 to control the supply direction and amount of hydraulic oil supplied from the hydraulic pump 51 to each hydraulic actuator, thereby controlling the operating direction and operating speed of each hydraulic actuator (controlling the operating direction and operating speed of the jacking apparatus 10 and the aerial work apparatus).

[0023] When the aerial work vehicle 1 having such a configuration is parked at the intended work site and the required work is performed, before the work begins (before the jacks 10f, 10r are operated), the parking brake is activated to brake the left and right rear wheels 5r, and then a wedge-shaped wheel stopper member 71 is installed between the parking road surface G and the outer peripheral surface (tread surface, tread surface) 5t of the tire wheel 5 (see Figure 5) to prevent the vehicle from running away.

[0024] Next, the structure of the wheel stop device 70 of this embodiment will be described with reference to Figures 3 to 7. For convenience of explanation, the length direction of the wheel stop member 71 will be referred to as the "front-rear direction," and the width direction of the wheel stop member 71 will be referred to as the "front-rear direction." The direction is defined as the "left-right direction" and the height direction of the wheel stopper member 71 as the "up-down direction", but this does not specify the arrangement direction of the wheel stopper device 70 (wheel stopper member 71).

[0025] The wheel stop device 70 is mainly composed of a pair of wheel stop members 71 that are inserted between the outer peripheral surface 5t of the tire / wheel 5 and the parking road surface G (see FIG. 5), and a belt-shaped band 80 that connects the pair of wheel stop members 71. The pair of wheel stop members 71 have substantially the same configuration, and the same parts will be described with the same reference numerals.

[0026] The wheel stopper member 71 is formed in a wedge shape using, for example, a synthetic resin material (plastic material). The wheel stopper member 71 has a ground contact portion 73 forming the bottom portion that contacts the parking road surface G, a wheel stopper portion 74 that is disposed opposite the outer circumferential surface 5t of the tire / wheel 5, a top portion 75 that forms the uppermost portion, a back portion 76 that connects the ground contact portion 73 and the top portion 75, and a pair of left and right side portions 77.

[0027] The ground contact portion 73 has a non-slip portion 73a formed by successively forming peaks and valleys in the front-to-rear direction to prevent slipping on the ground. The wheel stopper portion 74 is formed as a curved surface that increases in height from the tip end side (the side inserted between the tire / wheel 5 and the parking road surface G) of the wheel stop member 71 toward the base end side and is concave diagonally upward, and is configured to be able to abut against the outer circumferential surface 5t of the tire / wheel 5. Note that part or all of this wheel stopper portion 74 may be formed as an inclined surface.

[0028] A band fastener 78, which forms a connecting portion with the band 80, is attached to the upper portion of the wheel stopper member 71. The band fastener 78 is formed from metal, synthetic resin, or the like, and includes a fastening portion 78a bent into a U-shape and a pair of fixing portions 78b provided on both ends of the fastening portion 78a, the pair of fixing portions 78b being fastened to the side surface portion 77 of the wheel stopper member 71 with a plurality of screws 79. A band insertion opening 78c, through which the band 80 is inserted in the vertical direction, is formed between the band fastener 78 and the wheel stopper portion 74. Loop portions 81b, which will be described later and which are formed at each longitudinal end of the band 80, are fastened to the band fastener 78.

[0029] In addition, the connection position between the wheel stop member 71 and the band 80 (the position where the locking portion 78a is arranged) is set to a positional relationship that coincides or approximately coincides with the center of gravity of the wheel stop member 71 when viewed in a plane, and is configured so that when the wheel stop member 71 is hung from the band 80, the contact portion 73 of the wheel stop member 71 is horizontal.

[0030] The band 80 comprises a band body 81 formed in the shape of a long strip, a marker member 82 for indicating the longitudinal center position of the band body 81, a pair of handles 83 for the operator to grasp, and a pair of length adjustment buckles 84 for adjusting the effective length of the band body 81 (the actual distance from one wheel stop member 71 to the other wheel stop member 71 in the longitudinal direction of the band body 81).

[0031] The band body 81 is flexible and formed in a long strip shape. This band body 81 is made of a soft material such as soft vinyl chloride so that it can bend and deform along the outer peripheral surface 5t of the tire / wheel 5. The band body 81 may be made of a fabric such as synthetic fiber. A marker member 82, a handle 83, and a length adjustment buckle 84 are attached to this band body 81. As shown in FIG. 6, each end 81a of the band body 81 is inserted into the length adjustment buckle 84, then folded back to form a loop portion 81b, which is then inserted into the length adjustment buckle 84 again. The band fastener 78 of the wheel stopper member 71 is inserted into and attached to the loop portion 81b of this band body 81. The loop portion 81b is formed along the longitudinal direction of the band 80 or the band body 81. The band edge is a substantial end of the band.

[0032] The marker member 82 is made of metal, synthetic resin, or the like, and serves as a marker indicating the longitudinal center position of the band 80. The marker member 82 is formed in a rectangular ring shape with two elongated holes (not shown), and is attached with the band body 81 inserted into each of the elongated holes. The overall length of the band 80 (the effective length of the band body 81) can be adjusted with a pair of length adjustment buckles 84, but when adjusting the effective length of the band 80 in accordance with the diameter of the tire / wheel 5, the adjustment amount for each length adjustment buckle 84 should basically be uniform, so the longitudinal center position of the band 80 (i.e., the position indicated by the marker member 82) will always be approximately constant.

[0033] The handles 83 are made of metal, synthetic resin, or the like, and are gripped by an operator when transporting, installing, or removing the wheel stopper device 70. The handles 83 are formed in a rectangular ring shape with an opening in the center, and are fixed to the surface side of the band body 81. The pair of handles 83 are attached to the band body 81 at positions approximately equidistant from the marker members 82 along the longitudinal direction of the band body 81.

[0034] The length adjustment buckle 84 is made of metal, synthetic resin, or the like and includes a frame portion 84a formed in a horizontally elongated rectangular ring shape and a hook portion 84b suspended in the middle of the frame portion 84a. Two band through-holes 84c are formed between the frame portion 84a and the hook portion 84b, penetrating the front and back of the length adjustment buckle 84. The length adjustment buckle 84 is attached by alternately inserting the band main body 81 through the two band through-holes 84c, folding it back into a loop shape, passing it through the band insertion opening 78c of the ring stopper member 71, and then alternately inserting the band main body 81 back through the two band through-holes 84c. The length adjustment buckle 84 is attached so as to be movable (slidable) along the longitudinal direction of the band main body 81. By moving the length adjustment buckle 84 along the longitudinal direction of the band main body 81, the folded length of the loop portion 81b (the length of the folded portion) can be changed, thereby adjusting the effective length of the band main body 81. Specifically, moving the length adjustment buckle 84 downward to shorten the length of the loop portion 81b increases the effective length of the band body 81, and moving the length adjustment buckle 84 upward to lengthen the length of the loop portion 81b decreases the effective length of the band body 81. This allows the effective length of the band body 81 to be adjusted appropriately according to the diameter of the tire / wheel 5, making it possible to install the wheel stopper device 70 on tire / wheel 5 of any size.

[0035] Next, a procedure for installing the wheel chock device 70 of this embodiment will be described. The installation work of this wheel chock device 70 is performed after the parking brake of the vehicle parked at the target work site is applied from inside the driver's cabin 7 to hold the left and right rear wheels 5r in a braked state. If the parking surface G of this aerial work vehicle 1 is flat, the wheel chock device 70 is installed for at least the rear wheels 5r, and if the parking surface G is sloping, the wheel chock device 70 is installed for all wheels 5 (front wheels 5f and rear wheels 5r).

[0036] First, to install the wheel stopper device 70 on the tire / wheel 5, the operator grasps the pair of handles 83 and lifts up the wheel stopper device 70. When the wheel stopper device 70 is lifted up, the pair of wheel stopper members 71 are suspended from both longitudinal ends of the band 80. Next, the marker member 82 of the band 80 is aligned with the center position of the tire / wheel 5 in the fore-and-aft direction (the top of the outer circumferential surface 5t of the tire / wheel 5), and the band 80 is placed along the outer circumferential surface 5t of the tire / wheel 5 (the band 80 is hung on the outer circumferential surface 5t of the tire / wheel 5). As a result, the pair of wheel stopper members 71 are installed at the front and rear of the tire / wheel 5 while suspended from the band 80 (they are inserted from the front and rear between the outer circumferential surface 5t and the parking road surface G). In this way, by simply grasping the pair of handles 83 and placing the band 80 on the outer circumferential surface 5t of the tire / wheel 5, the operator does not have to bend down. The wheel stopper members 71 can be installed while the operator maintains an upright posture without having to move the jacks 10f, 10r, improving workability. By installing the pair of wheel stopper members 71 in appropriate positions in front of and behind the tire / wheel 5 in this manner, it is possible to effectively prevent the vehicle from running away when the jacks 10f, 10r are extended.

[0037] After the wheel stopper device 70 has been installed, the lower operating device 27 is first operated to extend the front jack 10f, thereby lifting the front wheels 5f off the ground. At this time, the rear wheels (parking brake wheels) 5r are in contact with the ground, so even if the parking road surface G is inclined, the vehicle will not run downhill. Next, after confirming that the front wheels 5f have lifted off the ground, the lower operating device 27 is operated to extend the rear jack 10r, thereby lifting the rear wheels 5r off the ground. The lower operating device 27 is then further operated to adjust the extension amount of each jack 10f, 10r, thereby adjusting the vehicle body 2 to be horizontal. This allows all tires and wheels 5 to be lifted off the ground, and the entire vehicle can be lifted and supported in a horizontal position. When the tire / wheel 5 is lifted up when the vehicle is jacked up in this manner, the entire wheel stop device 70, together with the tire / wheel 5, is lifted off the parking road surface G, and each wheel stop member 71 suspended from the band 80 is also lifted off the parking road surface G. At this time, each wheel stop member 71 is suspended in a substantially vertical direction in front of and behind the tire / wheel 5, and is therefore held in an appropriate position and orientation relative to the outer circumferential surface 5t of the tire / wheel 5. Furthermore, since the band main body 81 is formed wide (and has a certain degree of stiffness), and the wheel stop member 71 is supported across the entire width of the band main body 81, the wheel stop member 71 does not swing and rotate as would occur if the wheel stop member 71 were connected by a string-like object such as a rope, and the position and orientation of the wheel stop member 71 relative to the tire / wheel 5 can be stabilized. Furthermore, when the vehicle is jacked up in this manner (when the tire / wheel 5 is lifted), each wheel stopper member 71 is suspended approximately vertically from both ends of the band 80 and is restrained by the band 80, so that even if the position and orientation of the wheel stopper member 71 is slightly misaligned with respect to the tire / wheel 5 when the wheel stopper member 71 is in contact with the ground, the position and orientation of the wheel stopper member 71 with respect to the tire / wheel 5 can be appropriately corrected when the vehicle is jacked up. As described above, the connecting position between the wheel stopper member 71 and the band 80 is set to a positional relationship that coincides or approximately coincides with the center of gravity of the wheel stopper member 71 in a plan view, so when the wheel stopper member 71 is suspended from the band 80 (when it is floating above the parking road surface G), the ground contact portion 73 of the wheel stopper member 71 is maintained in a horizontal state.As a result, when the vehicle is jacked up, the wheel stopper member 71 can be held in the correct position relative to the tire wheel 5 without tilting up or down, and when the vehicle is jacked down, the wheel stopper member 71 can be properly landed on the parking road surface G.

[0038] Then, when the required high-altitude work is completed, first, the lower operating device 27 is operated to retract the rear jack 10r, thereby bringing the rear wheels 5r into contact with the parking road surface G. At this time, by bringing the rear wheels (parking braked wheels) 5r into contact with the road surface G before the front wheels 5f (parking non-braked wheels), the vehicle will not move downhill even if the parking road surface G is sloping. Next, the lower operating device 27 is operated to retract the front jack 10f, thereby bringing the front wheels 5f into contact with the parking road surface G. As a result, all of the tire / wheels 5 are in contact with the parking road surface G. When each tire / wheel 5 is lowered by jacking down the vehicle in this way, the entire wheel chock device 70 also lowers together with the tire / wheel 5. At this time, the band 80 of the wheel stopper device 70 is hung around the tire / wheel 5, and when the tire / wheel 5 touches down on the parking road surface G in response to the retracting (retracting) operation of the jacks 10f, 10r, the pair of wheel stopper members 71 suspended from this band 80 also land on the parking road surface G while maintaining their positional relationship with the tire / wheel 5, thereby setting the pair of wheel stopper members 71 in appropriate positions in front and behind the tire / wheel 5. By setting the pair of wheel stopper members 71 in appropriate positions in front and behind the tire / wheel 5 in this way, it becomes possible to effectively prevent the vehicle from running away when the jacks 10f, 10r are retracted.

[0039] Here, if the vehicle is jacked up and down in the above-described order (when jacking up: front jack 10f → rear jack 10r, when jacking down: rear jack 10r → front jack 10f), the parking position of the vehicle after jacking down may be shifted forward or backward from its original parking position (the ground contact position of the tire / wheel 5 after jacking down may be shifted forward or backward from its original ground contact position). In this case, with the conventional technology, the installation position of the wheel stopper member 71 installed when jacking up remains the same when jacking down (because the wheel stopper member 71 remains placed on the parking road surface G before and after jacking up and down). Therefore, if the parking position of the vehicle (the installation position of the tire / wheel 5) is shifted forward or backward when jacking down the vehicle, there is a risk that the wheel stopper member 71 may be run over by the tire / wheel 5, which causes a problem in that it becomes difficult to retrieve the wheel stopper device 70 at the end of the work. In contrast, in this embodiment, when jacking up and down the vehicle, the wheel stop device 70 rises and falls integrally with the tire / wheel 5, so the positional relationship between the tire / wheel 5 and the wheel stop member 71 does not change, and when the vehicle is jacked down, the wheel stop member 71 can be landed at a position maintaining an appropriate distance from the tire / wheel 5, preventing the wheel stop member 71 from being run over by the tire / wheel 5 (the wheel stop device 70 can be easily retrieved when the work is completed).

[0040] To remove or attach the wheel stopper device 70 from the tire / wheel 5, the worker can simply stand up, grasp the pair of handles 83, and lift the entire wheel stopper device 70 toward themselves, thereby pulling the entire wheel stopper device 70 away from the tire / wheel 5.

[0041] As described above, according to the wheel stop device 70 of this embodiment, the pair of wheel stop members 71 suspended from both longitudinal ends of the band 80 can be correctly installed on the tire wheel 5 by simply hanging the long, strip-shaped band 80 along the outer peripheral surface 5t of the tire wheel 5, thereby reducing the burden on the worker (the worker can install the wheel stop members 71 while maintaining an upright posture without lowering his / her waist and bending), and the original effect of the wheel stopper can be fully exerted to prevent the vehicle from running away, thereby improving workability and safety.

[0042] In addition, in the wheel stopper device 70 of this embodiment, a pair of handles 83 are provided at a predetermined distance in the middle of the longitudinal direction of the band 80, and by grasping this pair of handles 83 and lifting the wheel stopper device 70, the entire band 80 bends into an inverted U-shape and can be easily hung on the outer peripheral surface 5t of the tire wheel 5, further improving workability.

[0043] Furthermore, the wheel stopper device 70 of this embodiment is provided with a marker member 82 that indicates the longitudinal center position of the band 80, making it easy to align the longitudinal center position of the band 80 with the fore-and-aft center position of the tire / wheel 5, and making it possible to easily and accurately install the wheel stopper device 70 on the tire / wheel 5.

[0044] Furthermore, in the wheel stopper device 70 of this embodiment, the length (effective length) of the band 80 can be adjusted using the length adjustment buckle 84 according to the diameter of the tire / wheel 5, making it adaptable to tire / wheel 5 of all sizes (there is no need to use different wheel stopper devices 70 depending on the size of the tire / wheel 5), making it easier to install, manage, and store the wheel stopper device 70.

[0045] Furthermore, in the wheel stop device 70 of this embodiment, when viewed in a plane (viewed from a direction perpendicular to the underside of the wheel stop member 71), the connection portion between the wheel stop member 71 and the band 80 is located at a position that overlaps with the center of gravity of the wheel stop member 71. As a result, when the vehicle is jacked up, the ground contact portion 73 of the wheel stop member 71 becomes horizontal, and the wheel stop member 71 is maintained in the correct position relative to the tire / wheel 5 without tilting up or down, so that the ground contact portion 73 of the wheel stop member 71 can be properly landed on the parking road surface G when the vehicle is jacked down.

[0046] The present invention is not limited to the above-described embodiment, and can be modified as appropriate without departing from the spirit of the present invention.

[0047] In the above embodiment, a band fastener 78 is provided to connect the ring stopper member 71 and the band 80, but the present invention is not limited to this configuration, and a connecting portion for connecting the band 80 may be formed directly on the ring stopper member 71. For example, as shown in Fig. 8, a slit 178 for inserting the band main body 81 and a fastening portion 179 for fastening the loop portion 81b of the band main body 81 may be formed in the upper portion of the ring stopper member 71, so that the ring stopper member 71 is directly connected to each end of the band 80 without using a separate part (band fastener 78).

[0048] In the above embodiment, a truck-mounted aerial work vehicle has been described as an example of a vehicle (work vehicle) according to the present invention, but the present invention is not limited to this and may be applied to other work vehicles such as crane trucks, transport vehicles such as dump trucks, etc. Furthermore, in the above embodiment, an electrically driven (battery-driven) aerial work vehicle has been described as an example, but the present invention is not limited to this and may be a PTO-driven aerial work vehicle that extracts engine power via a PTO mechanism (power take-off mechanism) to drive a hydraulic pump, or a hybrid aerial work vehicle that has both and selectively switches between power sources. [Explanation of symbols]

[0049] 1. Aerial work platform (vehicle) 2. Body 5 Tires and wheels (wheels) 5t outer surface 10 Jacking device 27 Lower operating device 45 Upper control device 60 Controller 70 Wheel chock device 71 Wheel stopper 73 Grounding part 74 Wheel stopper 78 Band fastener (connection part) 80 Band 81 Band body 82 Marking material 83 Toride 84 Length adjustment buckle (length adjustment mechanism) 178 Slit 179 Locking part (connecting part) G Parking road surface

Claims

1. A portable wheel chock device that restricts the movement of a parked vehicle, a flexible, long, strip-shaped body; a pair of ring stoppers provided at both longitudinal ends of the band-shaped body, A wheel stopper device characterized in that by hanging the strip around the outer surface of the wheel along the outer periphery of the wheel installed on the vehicle, the pair of wheel stopper members suspended from both longitudinal ends of the strip can be installed in front of and behind the wheel on the parking road surface.

2. 2. The wheel stopper device according to claim 1, wherein a pair of handles that can be gripped by a user are provided at a longitudinally intermediate portion of the band-shaped body at a predetermined interval in the longitudinal direction.

3. 3. The wheel stopper device according to claim 1, wherein the band-shaped body is provided with a marking member for indicating the center position of the band-shaped body in the longitudinal direction.

4. 4. The wheel stopper device according to claim 1, wherein the band-shaped member is provided with a length adjustment mechanism for adjusting the length of the band-shaped member in the longitudinal direction.

5. the ring stopper member has a connecting portion to which an end portion of the band-shaped body in the longitudinal direction is connected, A wheel stop device according to any one of claims 1 to 4, characterized in that, when viewed from a direction perpendicular to the underside of the wheel stop member, the connecting portion is provided at a position that overlaps with the center of gravity of the wheel stop member.

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